I am now the proud keeper of a North Bros, Yankee No44, pat jan 25, 92, june 6,
05, and mar 5, 06 in decent operational condition except for the chuck, which is
solid. To free it, I am working on the assumption that the chuck is the push
collar type, not the threaded collar type. Is this correct? I am presently at
the soak in penetrant stage, and don't want to proceed past the heat stage
without confirmation, as I have no spare Yankee push drill chucks at the moment.
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